Destroy window and layers in Simplicity watchface

The SDK example for Simplicity watchface doesn't destroy any layers nor windows. Is this the correct way to do it?

Is this a memory leak (I don't know if there is some default cleanup for watchfaces...)

If its a memory leak, would you mind sharing if the pre-bundled Simplicity watchface has the same bug? That might explain some of the issues I've been having with my watch...

Cheers!